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According to Cnet.com, security firm Sophos has highlighted yet another scam that’s zipping around Facebook in the form of a third-party application, this one spreading in the form of links claiming to be from friends that encourage members to install a Facebook “dislike button.”

Sophos wrote about the scam in a post on Monday, pointing out that a link to it tends to appear in wall posts that appear to be from the user’s friends (“I just got the Dislike button, so now I can dislike all of your dumb posts lol!!”) but which are actually automated messages from friends who have already been duped. The scam’s purpose is to force users to complete a survey contained in the application, a bit of trickery that has already been known to be perpetuated through scam links like “Justin Bieber trying to flirt” and “Anaconda coughs up a hippo,” the two of which presumably would be enticing to rather different demographics of Facebook users.

As Facebook’s surging membership numbers have blazed past 500 million around the world, its channels of fast social connection and messaging have become a prime target for scammers and viruses.This one’s particularly nasty because a “dislike button,” offering some kind of counterpoint to Facebook’s own “like” button is something that many members have been clamoring for.

John Sileo is a information security expert that speaks professionally to organizations that want to protect their profits against identity theft, social media exposure and corporate espionage. His recent clients include the Department of Defense, FDIC, FTC and Pfizer.